V4L/DVB (4493): [lnbp21] release callback fixed

lnbp21 module must use fe->ops.release_sec, not fe->ops.release.
The release function of the frontend driver was never called for cards
with lnbp21...
Signed-off-by: Oliver Endriss <o.endriss@gmx.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

drivers/media/dvb/frontends/lnbp21.c

@@ -122,7 +122,7 @@ struct dvb_frontend *lnbp21_attach(struct dvb_frontend *fe, struct i2c_adapter *
 	}
 
 	/* install release callback */
-	fe->ops.release = lnbp21_release;
+	fe->ops.release_sec = lnbp21_release;
 
 	/* override frontend ops */
 	fe->ops.set_voltage = lnbp21_set_voltage;